Improvement in coal-screens



UNITED STATES PATENT OFFICE.

JOHN R. DEIHM AND JASPER SNELL, OF POTTSVILLE, PENNSYLVANIA.

IMPROVEMENT IN COAL-SCREENS.

Specification forming part of Letters Patent No. 13, l S5, dated June21, 1864.

To all whom zt 'may concern:

Bo it known that We, JOHN R. DEIHM and JASPER SNELL, of Pottsville, inthe county of Schuylkill and State of Pennsylvania, have invented a newand useful Im provement in the Construction of the CylindricalCoal-Screens; and we do hereby declare that the following is a full,clear, and exact description of the same, reference being' had to theaccompanying drawings, making a part of this specitication, in which-Figure 1 is a longitudinal central section of our invention, a; a', Fig.2, indicating the plane of section Fig. 2, a transverse section of the Isame, taken in the line y y, Fig. i. I

Similar letters of reference indicate corresponding parts in the twofigures.

This invention consists in constructing the screen ot' a series ofsegments, composed ot' longitudinal cast-iron bars, connected bytransverse wrought-iron rods, the former being cast on the latter, so asto obtain a tirm connection ot' the parts, the segments beingV attachedto bands at their ends, and all arranged as hereinafter fully shown anddescribed whereby a very superior coal screen is obtained, inconsequence ofthe parts being always retained in proper position, and afree escape allowed for the coal and dirt, while the segments arerendered capable of being c'urved or bent to suit the required diameterof the To enable those skilled in the art to fully understand andconstruct our invention, we will proceed to describe it.

A represents a series ot' segments of which the screen is composed.These segments are formed each of longitudinal cast-iron bars a, (four,more or less,) the outer surfaces of which are straight, and the innersurfaces provided with projections b.

c represents wrought-iron rods, which pass through the bars a at rightangles, and at suitable and equal distances apart. The rods c have thelongitudinal bars c cast on them, the former being placed in the moldsand arranged in such a manner as to obtain this result when the bars aare cast. By this means a very firm connection of the bars a and rods cis obtained, as the bars c in cooling will shrink firmly on the rods c,and the latter, and

also the bars a, will be eiiteetually prevented from slipping out of aproper relative position with each other. The longitudinal cast-ironbars a are cast rather wider at their ends than at any other point, andthese Wide portions (designated by d) have recesses c in them to receivebands B, through which bolts j' pass, said bolts also passing throughbands O, on which the ends of the segments rest, and which serve toretain the segment in proper position in the form of a cylinder.

Besides the rmness with which the bars c and rods c are securedtogether, the invention possesses the advantage of alldwing the segmentsA to be bent or curved to form screens ot greater or less diameter, asmay be required. The openings also of the screen admit of the coal anddust passing freely through them. The screen may be economicallymanufactured, and it will be extremely durable, there being no partsthat can be casually displaced.

Having thus described our invention, we claim as new and desire tosecure by Letters Patent, as an improved article of manufacture- Acylindrical coal-screen composed of a series of segments, constructedand connected together in the manner substantially as herein set forth.

' JOHN R. DEIHM.

JASPER SNELL. Witnesses:

WM. L. YoDER, W. R. MORTIMER.

